There can be a lot of pressure to express your love in the perfect way on Valentine's Day. Do you go with the generic, "I love you" along with some flowers? Do you prepare a deep, thought out speech before a big kiss?

Quantified Impressions, a communications analytics company, set out to find out the best phrase for love on Valentine's Day. The Austin, Texas, based company asked 100 people to rank their favorites from the 20 most popular ways to say "I love you." Fifty men and 50 women also ranked their least favorite.

Quantified Impressions used communication technology to figure out why the favorite ways to say "I love you" are so effective.

"We looked at what words are successful when talking about Valentine's Day verse what comes up in every day conversation," Noah Zandan, the president of the company told ABCNews.com. "Personal and present tense rose to the top versus sayings like 'You were the love of my life.'"

Men and women differed on their favorite Valentine's Day phrase. Men's top choice was "You are the love of my life!" while women preferred "You're my soul mate and the love of my life."

Both sexes agreed that "I think that I love you" is the worst way to express your love, so make sure you know before you convey your love.